Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4878239 | Anonymous interactive telephone system with expanded outward calling features | John Kimball | 1989-10-31 |
| 4847890 | Anonymous interactive telephone system | John Kimball | 1989-07-11 |